<template>
  <view class="u-wrap">
    <!-- <view class="u-search-box">
			<view class="u-search-inner">
				<u-icon name="search" color="#909399" :size="28"></u-icon>
				<text class="u-search-text">搜索uView</text>
			</view>
		</view> -->
    <view class="u-menu-wrap">
      <scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
        <view
          v-for="(item, index) in tabbar"
          :key="index"
          class="u-tab-item"
          :class="[current == index ? 'u-tab-item-active' : '']"
          :data-current="index"
          @tap.stop="swichMenu(index)"
        >
          <text class="u-line-1">{{ item.categoryName }}</text>
        </view>
      </scroll-view>
      <block v-for="(item, index) in tabbar" :key="index">
        <scroll-view scroll-y class="right-box" v-if="current == index">
          <view class="page-view">
            <view class="class-item">
              <!-- <view class="item-title">
								<text>{{item.name}}</text>
							</view> -->
              <view class="item-container">
                <view class="thumb-box" v-for="(item1, index1) in item.goods" :key="index1">
                  <image @click="toDetails(item1)" class="item-menu-image" :src="item1.goodsImage.split(',')[0]" mode=""></image>
                  <view class="item-menu-name">{{ item1.goodsName }}</view>
                </view>
              </view>
            </view>
          </view>
        </scroll-view>
      </block>
    </view>
  </view>
</template>

<script setup>
import { getCategoryListApi } from '../../api/category.js';
import { ref, getCurrentInstance } from 'vue';
import { onLoad } from '@dcloudio/uni-app';
// 获取组件实例
const instance = getCurrentInstance();
const tabbar = ref([]);
const scrollTop = ref(0);
const current = ref(0);
const menuHeight = ref(0);
const menuItemHeight = ref(0);
const getImg = () => {
  return Math.floor(Math.random() * 35);
};
const swichMenu = async (index) => {
  if (index == current.value) return;
  current.value = index;
  // 如果为0，意味着尚未初始化
  if (menuHeight.value == 0 || menuItemHeight.value == 0) {
    await getElRect('menu-scroll-view', 'menuHeight');
    await getElRect('u-tab-item', 'menuItemHeight');
  }
  // 将菜单菜单活动item垂直居中
  scrollTop.value = index * menuItemHeight.value + menuItemHeight.value / 2 - menuHeight.value / 2;
};
const getElRect = (elClass, dataVal) => {
  new Promise((resolve, reject) => {
    const query = uni.createSelectorQuery().in(instance);
    query
      .select('.' + elClass)
      .fields({ size: true }, (res) => {
        // 如果节点尚未生成，res值为null，循环调用执行
        if (!res) {
          setTimeout(() => {
            getElRect(elClass);
          }, 10);
          return;
        }
        instance[dataVal] = res.height;
      })
      .exec();
  });
};
//获取分类数据
const getCategoryList = async () => {
  let res = await getCategoryListApi();
  if (res && res.code == 200) {
    tabbar.value = res.data;
  }
};
//跳转详情
const toDetails = (item) => {
  console.log(item);
  //在起始页面跳转到details.vue页面并传递参数
  uni.navigateTo({
    url: '../detail/detail?goods=' + JSON.stringify(item)
  });
};
onLoad(() => {
  getCategoryList();
});
</script>

<style lang="scss" scoped>
.u-wrap {
  height: calc(100vh);
  /* #ifdef H5 */
  height: calc(100vh - var(--window-top));
  /* #endif */
  display: flex;
  flex-direction: column;
}

.u-search-box {
  padding: 18rpx 30rpx;
}

.u-menu-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.u-search-inner {
  background-color: rgb(234, 234, 234);
  border-radius: 100rpx;
  display: flex;
  align-items: center;
  padding: 10rpx 16rpx;
}

.u-search-text {
  font-size: 26rpx;
  color: $u-tips-color;
  margin-left: 10rpx;
}

.u-tab-view {
  width: 200rpx;
  height: 100%;
}

.u-tab-item {
  height: 110rpx;
  background: #f6f6f6;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26rpx;
  color: #444;
  font-weight: 400;
  line-height: 1;
}

.u-tab-item-active {
  position: relative;
  color: #000;
  font-size: 30rpx;
  font-weight: 600;
  background: #fff;
}

.u-tab-item-active::before {
  content: '';
  position: absolute;
  border-left: 4px solid #f3af28;
  height: 32rpx;
  left: 0;
  top: 39rpx;
}

.u-tab-view {
  height: 100%;
}

.right-box {
  background-color: rgb(250, 250, 250);
}

.page-view {
  padding: 16rpx;
}

.class-item {
  margin-bottom: 30rpx;
  background-color: #fff;
  padding: 16rpx;
  border-radius: 8rpx;
}

.item-title {
  font-size: 26rpx;
  color: $u-main-color;
  font-weight: bold;
}

.item-menu-name {
  font-weight: normal;
  font-size: 24rpx;
  color: $u-main-color;
}

.item-container {
  display: flex;
  flex-wrap: wrap;
}

.thumb-box {
  width: 33.333333%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  margin-top: 20rpx;
}

.item-menu-image {
  width: 120rpx;
  height: 120rpx;
}
</style>
